That bike was sold from 1993 to 2005 with various component configurations. And excellent quality to you might be mediocre to someone who really knows bikes. New tubes and decent tires are going to set the buyer back $70 to $140 for the pair, and they almost certainly will need replacing.
The bike blue book site puts a value of $147on the 2005 model in excellent condition. Yours could be much older, and without pics we can't know how much below excellent it really is (though needing new tires already knocks it out of the excellent category).Fortunately the bike blue book site seems to under-estimate street resale value by half. I've never found any bike worth owning for less than double the bicyclebluebook site's estimate. Maybe I'm just unlucky.
So if double is a correct high end, your bike is worth no more than $300, and probably less if it is older than 2005 or lower than excellent condition. If you do list it somewhere do be prepared to include the model year, groupset information, lots of pictures, a picture of the serial number, and the all important frame size (nobody should buy a road bike without knowing it's size, yet used postings often forget to mention it and sellers even sometimes get annoyed when asked).
If the bike has been rebuilt with an Ultegra or Dura-Ace groupset from the last five to seven years it would fetch more (considerably) than if it has its stock group set. If it's wheels are known high end in newer condition, that helps too. But these are unlikely upgrades.